[Cherry-Pick][XPU] Enable CudaGraph capture for MTP draft model(#7864)#7941

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Clarity256:feature/mtp-cudagraph-draft-model-xpu

Commits on May 27, 2026

[XPU] Enable CudaGraph capture for MTP draft model

Clarity256
and
claude
committed

Commits on May 28, 2026

[XPU] Fix missing mtp_step_paddle import in mtp_xpu.py

Clarity256
and
claude
committed

Commits on Jun 3, 2026

[XPU] Fix MTP CudaGraph dummy_prefill expected_decode_len for TP>1
Clarity256
committed

Commits on Jun 9, 2026

Fix MTP CudaGraph memory issue by using copy_ instead of clone
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